AS18371 Neighbourhood Cable
2402:b801:3000::/36 - IINET-AU-20120806
inet6num: 2402:b801::/32 netname: IINET-AU-20120806 descr: iiNet Limited descr: Accounts Payable Department descr: Locked Bag 16 country: AU org: ORG-IL1-AP admin-c: NO20-AP tech-c: NO20-AP status: ALLOCATED PORTABLE mnt-by: APNIC-HM mnt-lower: MAINT-AU-IINET mnt-irt: IRT-IINET-AU remarks: -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ remarks: This object can only be modified by APNIC hostmaster remarks: If you wish to modify this object details please remarks: send email to firstname.lastname@example.org with your organisation remarks: account name in the subject line. remarks: -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ last-modified: 2017-08-29T23:02:34Z source: APNIC person: Network Operations nic-hdl: NO20-AP e-mail: email@example.com address: iiNet Limited address: Level 1 address: 502 Hay Street address: Subiaco WA 6008 phone: +61 8 9214 2222 fax-no: +61 8 9214 2211 country: AU mnt-by: MAINT-AU-IINET last-modified: 2012-01-16T06:42:06Z source: APNIC irt: IRT-IINET-AU address: iiNet Limited address: Level 9, 250 St Georges Tce address: Perth address: WA 6000 e-mail: firstname.lastname@example.org abuse-mailbox: email@example.com admin-c: IH207-AP tech-c: IH207-AP auth: # Filtered mnt-by: MAINT-AU-IH207-AP last-modified: 2010-12-15T02:05:54Z source: APNIC
IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.
Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.